71MWe PFBC demonstration plant has been operated since 1992 in EPDC Wakamatsu Work. At PFBC boiler the temperatures of combustion is low, so concentration of NO
x in the exhaust gas is kept low. But selective catalytic reaction (SCR) system is adapted for the environmental demand for coal thermal power plants in Japan. Still more, we introduce the selective non-catalytic reaction (SNCR) system and verify the characteristic.
In the test, we investigate high efficiency NO
x reduction by increase of amount of NH
3 injection. Amount of NH
3 injection is suitable for more than 1 by [NH
3] / [NO
x] molar ratio. So far amount of NH
3 injection is limited by less than 1 at SCR because of limit of slip NH
3 at SCR outlet. But amount of slip NH
3 at SCR and SNCR system is as same as one at SCR system.
In this paper, we introduce the high efficiency NO
x reduction at SCR and SNCR system.
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